Fan



MI E-. HANSON FAN 3 Filed Nov. 9, 1957 -2 Sheets- Shet 1 4 Ifivenfior v M/(. TONE. HANSON 6y Ma @2222 @Wto 2 5763 Jam-3, 1939.

' M. E. HANSON FAN I Filed Nov. 9, 1937' 2 Sheets-Sheet 2 MLTO/V E. #44450 attorney atentecl Jan. 3, 1939. 2,142,842

UNBED STATES. PATENT OFFICE Milton E. Hanson, Collingswood, N. J assignmto B. F. Sturtevant Company, Boston, Mass;

Application November 9,1937, Serial No. 173,648

4 Claims. (Cl. 230--11'I) 1o tempering the primary air. Heretofore, in supelectric motor [2. The upper casing l3 formed 1:) plying mixed recirculated and primary air, it has as a frustrum of a cone, diverging With respec been the practice to use a relatively large fan to the in-coming air flow, provides the air inlet with single inlet, the primary air and the recir P ss ge to the b ad s H for h P y culated air being led to the fan inlet through which in the embodiment illustrated by Figs- 1 ducts which join adjacent the fan inlet. a d 3 s utd r a r supp d y t p ss I4 15 'A feature of this invention resides in the mixbetween the eilin 5 and roof ii f e c ring of recirculated air and primary air in a. fan The lower casing ll formed as theirustrum of without requiring a duct for supplying the recir- 00118, Converging with pe t t0 air 'fi fOrmS culated air. the inlet passage into the blades II for recircu- 2 According to this invention, a fan is provid d Iated irwhich may be suspended over the space to The upper Casing l3 and he l we Casing serv d, d hi draws recirculated 9 directly together and between each other, form a downfr th space Served, primary air from wardly pitched diverging air outlet passage from suitable source, and discharges the mixed the fan. .This ensures that the air from the fanwithout draft t t underlying space -is discharged angularly downward into the pas- 5 Another feature of the invention resides in the Sanger The angular]? Pitched fan blades provision of means for'independently varying the enable such a discharge passage to be provided. vommes of primary and of re'cimulated Mounted cross-wise the lower portion'of the drawn in by the fan v casing I! and attached thereto, is the plate 18,

An o provided with the p urality of apertures l9. Ro 3o inlet ifi gg? invention is to provlde f tatably mounted at 20 upon'the plate i8 is the Another object of the invention is to provide plate i provided with the plurality apertures a fan which draws in recirculated air directly whmh correspond number Size and shape fromthe space served and which s draws in with the apertures IS in the plate l8. The plate primary for mixture prior to its dischaige, l8 has 'the slot 23 through which the bolt if at- 35 r with the recirculated am tached to the plate 2| extends. The position of Another object of the invention is to,pr0vide 22 with respect the apertures a decorative effective fan which may be is varied by movement of the bolt 24 in the slot mounted in or adjacent the ceiling of an enby pressure p the nutzs' The correspond 40 clcsure ing apertures may be placed exactly in alignment 4 other objects of the invention Wm be a rentor may be placed completely out of alignment by from the following description taken i f the movement of the bolt 24 in the slot 23. When I drawing-s r corriexsnponding1 apertifires 31;} iltie ghginniseng; the

j-' ma um-youmeo rec a a awn g:tyzgz gg x g z ggzfi i in by the fanand when the corresponding aper- 45 tures are completely. out of alignment, no recir- Fig. l is an elevation view in section of a.,rai1- culated i b f F mt waypassenger car' equipped with fans embodyte 8 y e or ering this invention, in a pressure ventilating sysmedla Justments'rvolumes of l-echculated air licfilow 1the niiaximiim arfe drawn in byhthg fan, 50 e v0 ume. epen pg, 0 course, upon e egree 1s a Plan Vlew downwardly upon of over-lap of corresponding apertures. When ptfrtmn 0f the car of 1; Y the desired adjustment has been made, the plate 3 is an ge Sectlonal View taken along 2| is locked against further movement by screwthe hues qt eing up the nut 25 upon the bolt 24 so as to bind l Fig. 4 is a sgtlonal view of one embodiment of II This invention relates to fans and relates more particularly to-fans having air inlets on each side of one set of blades whereby two separate air streams maybe drawn into the blades and discharged in one stream. v

In air conditioning and pressure ventilating systems, itis desirable to mix recirculatedair with the primary air prior to the discharge of the air into the space served, for the purpose of a fan according to this invention, taken along the lines 4-4 of Fig. 5;

Fig. 5 is an elevation view in section of the fan of Fig. 4, and s Fig. 6 is a plan view looking from underneath, of the fan.

Referring first to Figs. 4, 5 and 6, the fan comprises the downwardly pitched, centrifugal blades i0 which are mounted on the shaft ll of the theplates 2| and II together.

The member 28 above the upper casing I3 is provided with a plurality of apertures 29 similar to the apertures IS in the plate l8. The plate 3| is attached to the member 28 by the rivets 3|! which are loosely fitted in a slot in the plate 3| and in holes in the member 28 so that the plate 3| may be rotated with respect to the member 28 by means of the handle 33 which may be an extension of the plate 3|. The plate 3 l is provided with the plurality of apertures 32 which are similar to the apertures 22 inthe plate 3!. By moving the handle 33 which extends through a slot in the bracket 34, corresponding apertures in the plate 3| and the member 28 may be placed in or out of alignment for varying the volume of primary air drawn in by the fan blades, or for shutting off the supply of primary air.

The air drawn in axially by the fan blades I is discharged at the outermost edges 28 of the blades I through the diverging space, with re-- spect to air flow, between the lower surface of the upper casing l3 and the upper surface of the lower casing IT. The downwardly pitched air ,discharge passage so provided enables the air to be directed positively into the passenger space, but at such a slight angle, that no drafts are produced.

The lower casing I1 is supported from the upper casing I! by the members 21 which may be bolted as at 38 to the casing l1 and may be secured in any suitable manner as by welding to the upper casing l3. The members 21 also serve as a decorative shield for the fan as shown by in the circular ceiling opening so that the primary air can enter the fan blades only through the apertures 32.

Figs. 1, 2, and 3 illustrate the application of several of the fans of this invention for providing pressure ventilation for a railway passenger car. Outdoor air enters the inlets 39 in the roof IQ of the car and passes through the filters 31, mounted in longitudinal walls and then into the passage l4 serving as a fresh air supply duct. The plurality of fans are mounted in circular openings in the ceiling l5 serving as the lower wall of the'duct or passage ll. Thefans may project the primary air without mixture with recirculated air into the car; may project mixed air into the car, or may recirculate the car air, as desired. Mixture of the recirculated air with the primary air serves two useful purposes: the primary air when too cool is tempered by mixture with the warmer recirculated air, and the drawing in of the recirculated air by the fans causes greater air movement and better air distribution of the air in the car.

While one embodiment of the invention has been described for the purpose of illustration, it should be understood that the invention is not to be limited to the exact arrangement described, as many departures and modifications will suggest themselves to those skilled in the art, after having had access to this disclosure.

What is claimed is:

1. A centrifugal fan for mounting in a perforated ceiling, comprising a motor having a vertical shaft, 9. fan wheel mounted on the lower end of said shaft, an annular supporting member for attaching said fan to said ceiling, means for supporting said motor from said member, air guiding means around said wheel, and means for supporting said air guiding means from said member.

2. A centrifugal fan for mounting in a perforated ceiling, comprising a motor having a ver tical shaft, a fan wheel mounted on the lower end of said shaft, air guiding means extending circumferentially around said wheel, supporting means extending circumferentially around said air guiding means for attaching said fan to said ceiling, and means for supporting said motor and said air guiding means from said supporting B8 3i centrifugal fan for mounting in a perforat ceiling, comprising a motor having a ver-- tical shaft, a fan wheel mounted on the lower end of said shaft, air guiding means extending circumferentially around said wheel, supporting means extending circumferentially around said air guiding means and between same and said motor for attaching said fan to said ceiling, and means for supporting said motor and said air guiding means from said supporting means.

4. A centrifugal fan for mounting in a perforated ceiling, comprising a motor having a vertical shaft, a fan wheel mounted on the lower end of said shaft, air guiding means extending circumferentially around said wheel, means having a horizontal portion for attachment to said ceiling and having upwardly extending and downwardly extending portions extending circumferentially around said air guiding means and between same and said motor for attaching said fan to said ceiling, and means for supporting said motor from said upwardly extending portions and for supporting said air guiding means from said downsvardly extending portions.

MILTON E. HANSON. 

